MPPT 75|15 (1)

>Surprised to see no LED on the Victron when I returned today at 6pm. When I left yesterday at 1pm it was registering a float charge to two Rolls 120Ah batteries that I had just connected in parallel. See [b]comment 1 on https://calstock.org.uk/elf.php/2001/01/01/rolls-batteries[/b]
>
>I soon discovered the 20A fuse had blown. I can not understand why. The Victron may well control the voltage and current but it cannot take much more than 8A from the panels. It may voltage adjust internally the 30+ voltage to 15 or less and have the ability to pass 16A to the battery but why it has channelled over 20A through itself is a mystery. I am about to email the vendors.
>
>I have repaired the fuse and all seems fine. The power light has been flashing since indicating the Battery Life algorithm is being run.
>
>I note, according to the manual, the only situation where the fuse should blow is when the battery is connected with reverse polarity.

and this to Victron

>Hello
>
>On 6th Nov I bought
>
> a Victron 75 | 15
> an REC 250w panel of 60 cells (nominal: volts 30.2; amps 8.3) (max open volts 37.4) (short circuit 8.86 amps)
> and two Rolls 120Ah batteries.
>
>On 12th Nov I connected the two batteries in parallel, so have 240Ah at 12v. The batteries are fully charged so when I connected them to the Victron and then the PV after 1 minute the yellow LED stayed on showing only a float charge. An hour or two later, around 1pm, I went out for the day and the weather was quite sunny
>
>I returned home this overcast and rainy day, 13th Nov at 6pm, to find to my surprise and disappointment, no LED light on the Victron. I discovered the fuse had blow. Once replaced all is fine.
>
>Could you tell me what may have happened?
>
>Thank you.
>
>Roger Lovejoy
Cornwall, UK